Category Archives: User Guides and Tutorials

What is a telescope filter

Posted on August 19, 2016 by Reviewer

When you look through your astronomical telescope at the night sky, telescope filters will help you see more detail. Filters come in many varieties to enhance viewing from light reduction, light pollution filters to different colours and ones that only … Continue reading →

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North Lincs Astro meeting . February 2016

Posted on March 4, 2016 by Reviewer

For the North Lincolnshire astronomy society meeting on Monday 1st Feb 2016 we had a workshop evening, with 3 different demonstrations going on at the same time. This gave the members a chance to mingle and chat at their own … Continue reading →

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What are auto focus binoculars

Posted on September 23, 2015 by Reviewer

Often you will hear the phrase or see in advertising the mention of auto focus binoculars. So what are auto focus binoculars ? I,m afraid to the best of my knowledge there is no such thing as auto focus. This … Continue reading →

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Celestron Power Seeker 80 AZS. Testing prime focus photography

Posted on June 12, 2015 by Reviewer

I have had a chance to test the prime focus performance of the Celestron powerseeker 80 AZ.. To connect a DSLR camera, you simply attach a t-ring to the telescope focuser..There is a t-thread on the scope, so no need … Continue reading →

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Can you use a star diagonal on a Newtonian reflector telescope

Posted on March 31, 2014 by Reviewer

A star diagonal is not recommended for use on a Newtonian reflector telescope. This is simply because there may not be enough inward travel to get infinity focus. You may be able to get around this by using a low … Continue reading →

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Celestron Edge HD telescopes and aplanatic optics

Posted on October 22, 2013 by Reviewer

Aberrations are defects in images produced by a telescope (or optical system). They are caused by limitations in the design and manufacture of the optics. Designers and optical factories strive to produce affordable telescopes that have as few aberrations as … Continue reading →

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Why do I need to polar align a telescopes

Posted on October 22, 2013 by Reviewer

As the earth rotates around its axis, the stars appear to move across the sky. If you are observing them using an altitude-azimuth (alt-az) mount, they will quickly drift out of view. Readjustments to get them back in view are … Continue reading →

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What are RA and DEC on an equatorial telescope

Posted on October 22, 2013 by Reviewer

RA (right ascension) and Dec (declination) are the coordinates on the sky that correspond to longitude and latitude on the earth. RA measures east and west on the celestial sphere and is like longitude on the earth. Dec measures north … Continue reading →

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Choosing the right telescope

Posted on October 22, 2013 by Reviewer

  There are lots of telescopes available on the market, and for the beginner, selecting one can be a bewildering experience. Before buying a telescope it is important to ask yourself the following questions, or simply contact Northern Optics telescopes of … Continue reading →

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Why does my Celestron Firstscope give an upside down image

Posted on June 26, 2013 by Reviewer

If everything is upside down when you use your telescope, don’t be alarmed. Astronomical telescopes are designed to give an upside down or inverted image. This is not a problem when looking at the sky, since orientation relative to the … Continue reading →

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